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Are you talking about trim tabs? As in mounted on the transom and actuated by hydraulic rams? Bennett trim tabs use ATF. If you have bennetts here is their FAQs http://www.bennetttrimtabs.com/faq1.htm#fluid
Yep. Talking about the hyd tabs mounted on the transom. Boat is an 89 bayliner trophy. I hear the pumps but tabs dont move so I'm hopeful the reservoir needs servicing.
Likely just need ATF added. There are two lines on the reservoir. Fill to the lower one with the tabs down and to the upper when the tabs are up. Cycle a few times and add if needed.